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      1 /*
      2  * Copyright (C) 2007 Apple Inc.  All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  * 1. Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  * 2. Redistributions in binary form must reproduce the above copyright
     10  *    notice, this list of conditions and the following disclaimer in the
     11  *    documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
     14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
     17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
     21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #include "config.h"
     27 #include "core/frame/History.h"
     28 
     29 #include "bindings/v8/ExceptionState.h"
     30 #include "core/dom/Document.h"
     31 #include "core/dom/ExceptionCode.h"
     32 #include "core/frame/LocalFrame.h"
     33 #include "core/loader/DocumentLoader.h"
     34 #include "core/loader/FrameLoader.h"
     35 #include "core/loader/FrameLoaderClient.h"
     36 #include "core/loader/HistoryItem.h"
     37 #include "core/page/BackForwardClient.h"
     38 #include "core/page/Page.h"
     39 #include "platform/weborigin/KURL.h"
     40 #include "platform/weborigin/SecurityOrigin.h"
     41 #include "wtf/MainThread.h"
     42 
     43 namespace WebCore {
     44 
     45 History::History(LocalFrame* frame)
     46     : DOMWindowProperty(frame)
     47     , m_lastStateObjectRequested(nullptr)
     48 {
     49     ScriptWrappable::init(this);
     50 }
     51 
     52 unsigned History::length() const
     53 {
     54     if (!m_frame)
     55         return 0;
     56     if (!m_frame->page())
     57         return 0;
     58     return m_frame->page()->backForward().backForwardListCount();
     59 }
     60 
     61 SerializedScriptValue* History::state()
     62 {
     63     m_lastStateObjectRequested = stateInternal();
     64     return m_lastStateObjectRequested.get();
     65 }
     66 
     67 SerializedScriptValue* History::stateInternal() const
     68 {
     69     if (!m_frame)
     70         return 0;
     71 
     72     if (HistoryItem* historyItem = m_frame->loader().currentItem())
     73         return historyItem->stateObject();
     74 
     75     return 0;
     76 }
     77 
     78 bool History::stateChanged() const
     79 {
     80     return m_lastStateObjectRequested != stateInternal();
     81 }
     82 
     83 bool History::isSameAsCurrentState(SerializedScriptValue* state) const
     84 {
     85     return state == stateInternal();
     86 }
     87 
     88 void History::back(ExecutionContext* context)
     89 {
     90     go(context, -1);
     91 }
     92 
     93 void History::forward(ExecutionContext* context)
     94 {
     95     go(context, 1);
     96 }
     97 
     98 void History::go(ExecutionContext* context, int distance)
     99 {
    100     if (!m_frame)
    101         return;
    102 
    103     ASSERT(isMainThread());
    104     Document* activeDocument = toDocument(context);
    105     if (!activeDocument)
    106         return;
    107 
    108     if (!activeDocument->canNavigate(*m_frame))
    109         return;
    110 
    111     m_frame->navigationScheduler().scheduleHistoryNavigation(distance);
    112 }
    113 
    114 KURL History::urlForState(const String& urlString)
    115 {
    116     Document* document = m_frame->document();
    117 
    118     if (urlString.isNull())
    119         return document->url();
    120     if (urlString.isEmpty())
    121         return document->baseURL();
    122 
    123     return KURL(document->baseURL(), urlString);
    124 }
    125 
    126 void History::stateObjectAdded(PassRefPtr<SerializedScriptValue> data, const String& /* title */, const String& urlString, FrameLoadType type, ExceptionState& exceptionState)
    127 {
    128     if (!m_frame || !m_frame->page() || !m_frame->loader().documentLoader())
    129         return;
    130 
    131     KURL fullURL = urlForState(urlString);
    132     if (!fullURL.isValid() || !m_frame->document()->securityOrigin()->canRequest(fullURL)) {
    133         // We can safely expose the URL to JavaScript, as a) no redirection takes place: JavaScript already had this URL, b) JavaScript can only access a same-origin History object.
    134         exceptionState.throwSecurityError("A history state object with URL '" + fullURL.elidedString() + "' cannot be created in a document with origin '" + m_frame->document()->securityOrigin()->toString() + "'.");
    135         return;
    136     }
    137     m_frame->loader().updateForSameDocumentNavigation(fullURL, SameDocumentNavigationHistoryApi, data, type);
    138 }
    139 
    140 } // namespace WebCore
    141